Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d152bde2a32dea…

MALICIOUS

PDF

79.9 KB Created: 2021-03-23 02:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e609469ba88a9a8321f8e1f5b7c68d8c SHA-1: 46eb30307bba2662d7e9baad917e839bbfe4c1af SHA-256: 88d152bde2a32deafeb2fbd2966fd6806b963a0f17cee97103a9daf92492ac32
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to PDF files, which is indicative of a link farm or SEO manipulation tactic. The presence of ClamAV detection and ML classification strongly suggests malicious intent. While no specific script was extracted, the PDF structure and numerous external URLs point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=what+is+ic+in+company
    • https://cdn.sqhk.co/xuwifoviwalo/2icjaid/counter_terrorist_game_for_pc_download.pdf
    • https://cdn.sqhk.co/nebinefis/TNic3jh/brokerage_account_number_format.pdf
    • https://cdn.sqhk.co/kifavubivelo/bjeiche/parallel_accounts_for_iphone.pdf
    • https://gisipunav.weebly.com/uploads/1/3/1/6/131636927/4900642.pdf
    • https://cdn.sqhk.co/sewuvavimebi/ijjieja/67926085484.pdf
    • https://cdn.sqhk.co/fezemepusap/djfhewd/65002739970.pdf
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/garunore.pdf
    • http://salebox.shop/night_by_elie_wiesel_filepfj1e.pdf
    • https://cdn.sqhk.co/tixunadegu/bljelgf/dunkleosteus_vs_megalodon_bite_force.pdf
    • https://cdn.sqhk.co/xaselavub/1nAgehj/vapad.pdf
    • https://cdn.sqhk.co/zujubokave/cichhia/nufikunavejinaje.pdf
    • http://maykistore.ru/vodobolorazakujep016wp.pdf
    • https://cdn.sqhk.co/pobopuwubox/hbdidCr/96967765324.pdf
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/dokoledetemuk_gopetiti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7add52c0-9eca-4f59-902e-754dc7a7ca39/nadivineb.pdf
    • https://s3.amazonaws.com/dazutun/committee_on_climate_change_annual_progress_report.pdf
    • https://s3.amazonaws.com/kitakilesa/letter_to_the_board_of_education.pdf
    • https://uploads.strikinglycdn.com/files/e91b6fc8-dab7-4891-a66e-86f56080297e/instep_bike_trailer_coupling.pdf
    • https://s3.amazonaws.com/vofadoloves/37082488671.pdf
    • https://s3.amazonaws.com/jivagajamav/list_of_automobile_industry_in_pune.pdf
    • https://s3.amazonaws.com/watajive/advanced_search_techniques.pdf
    • https://uploads.strikinglycdn.com/files/b7ae9acf-3383-4d14-bf2d-b5f8d9ede58b/static_and_dynamic_characters_in_the_adventures_of_huckleberry_finn.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85c.bin
1b722bbd8d44e240e01484c8766f4bc96967fddfc44416fb227c858434689cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 5160 bytes
font_01_sfnt_off000109d9.bin
e87ff3fbdae6f85e1998e1473036f2d64f81588ba32e94e087020fd19e302dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 11428 bytes

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